HD 89744

HD 89744
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Ursa Major
A
Right ascension 10h 22m 10.5619s[1]
Declination +41° 13′ 46.310″[1]
Apparent magnitude (V) 5.73[2]
B
Right ascension 10h 22m 14.8721s[3]
Declination +41° 14′ 26.514″[3]
Characteristics
Evolutionary stage Main sequence
Spectral type F7V[4] or F8IV[5]
B−V color index 0.531±0.003[2]
Astrometry
A
Radial velocity (Rv)−4.35±0.12[2] km/s
Proper motion (μ) RA: −120.285(42) mas/yr[1]
Dec.: −138.171(50) mas/yr[1]
Parallax (π)25.9334 ± 0.0436 mas[1]
Distance125.8 ± 0.2 ly
(38.56 ± 0.06 pc)
Absolute magnitude (MV)2.83[6]
B
Proper motion (μ) RA: −119.215(647) mas/yr[3]
Dec.: −140.390(457) mas/yr[3]
Parallax (π)26.0070 ± 0.4713 mas[3]
Distance125 ± 2 ly
(38.5 ± 0.7 pc)
Details
A
Mass1.37±0.09[7] M☉
Radius2.16+0.06
−0.01[8] R☉
Luminosity6.38±0.02[9] L☉
Surface gravity (log g)4.27±0.05[7] cgs
Temperature6,381±43[7] K
Metallicity [Fe/H]0.30±0.03[7] dex
Rotation~9 days[9]
Rotational velocity (v sin i)9.3[10] km/s
Age8.4[9] Gyr
B
Mass0.076[11] M☉
Other designations
BD+41°2076, GJ 9326, HD 89744, HIP 50786, HR 4067, WDS J10222+4114[12]
A: HD 89744A
B: Gaia DR3 804745827531820288, HD 89744B, 2MASS J10221489+4114266
Database references
A
SIMBADdata
Exoplanet Archivedata
ARICNSdata
B
SIMBADdata

HD 89744 is a star in the northern circumpolar constellation of Ursa Major, positioned about 0.4° due south of the bright star Tania Australis (μ UMa).[13] This object has a yellow-white hue and is dimly visible to the naked eye with an apparent visual magnitude of 5.73.[2] The distance to this star has been measured using the parallax method, which locates it 126 light years from the Sun. It is drifting closer with a radial velocity of −4.4 km/s.[2] There are two known exoplanets orbiting this star.

At various times the star HD 89744 has been assigned a stellar classification of F7V,[4][14] F7IV-V,[15] and F8IV,[5][2] suggesting it is an F-type main-sequence star that is evolving onto the subgiant branch. It is ~8.4[9] billion years old with an inactive chromosphere[15] and is spinning with a projected rotational velocity of 9.3 km/s.[10] The star is 2.16[8] times the size of the Sun with 1.4[7] times the Sun's radius. It is a high metallicity star, showing a greater abundance of heavier elements than in the Sun. The star is radiating 6.4[9] times the luminosity of the Sun from its photosphere at an effective temperature of 6,381 K.[7]

This star was identified as a member of the AB Doradus moving group by J. López-Santiago and collaborators in 2006.[16] It was later shown that its evolutionary state is incompatible with membership.[17]

In 2001, a faint co-moving companion was identified at an angular separation of 63.1″ from the primary.[18] This is equivalent to a linear projected separation of 2,456 AU (0.04 ly).[11] The companion, designated component B, is an L-class (~L0.5)[4] brown dwarf[18] with a mass of ~0.076 M☉.[11]

  1. ^ a b c d Cite error: The named reference Gaia DR3 for A was invoked but never defined (see the help page).
  2. ^ a b c d e f Cite error: The named reference Anderson_Francis_2012 was invoked but never defined (see the help page).
  3. ^ a b c d Cite error: The named reference Gaia DR3 for B was invoked but never defined (see the help page).
  4. ^ a b c Cite error: The named reference Scholz2016 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Gray_et_al_2006 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference Pizzolato_et_al_2000 was invoked but never defined (see the help page).
  7. ^ a b c d e f Cite error: The named reference Sousa_et_al_2018 was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference Gaia DR2 was invoked but never defined (see the help page).
  9. ^ a b c d e Cite error: The named reference Metcalfe_Egeland_2019 was invoked but never defined (see the help page).
  10. ^ a b Cite error: The named reference Morris_et_al_2019 was invoked but never defined (see the help page).
  11. ^ a b c Cite error: The named reference Mugrauer_et_al_2005 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference Simbad was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference Sinnott_Perryman_1997 was invoked but never defined (see the help page).
  14. ^ Cite error: The named reference Korzennik_et_al_2000 was invoked but never defined (see the help page).
  15. ^ a b Cite error: The named reference Wright2004 was invoked but never defined (see the help page).
  16. ^ Cite error: The named reference Lopez‐Santiago2006 was invoked but never defined (see the help page).
  17. ^ Cite error: The named reference Schaefer2018 was invoked but never defined (see the help page).
  18. ^ a b Cite error: The named reference Wilson_et_al_2001 was invoked but never defined (see the help page).